(PECL solr >= 0.9.2)
SolrDocument::merge — Merges source to the current SolrDocument
public SolrDocument::merge ( SolrDocument $sourceDoc [, bool $overwrite = true ] ) : bool
Merges source to the current SolrDocument.
sourceDoc
The source document.
overwrite
If this is true
then fields with the same name in the destination document will be overwritten.
Returns true
on success or false
on failure.
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https://www.php.net/manual/en/solrdocument.merge.php